Are you sure you have sufficient belt wrap on the pulley between the 775pros, if you're using a single belt for the whole thing?

What are you planning for the encoders?

Do you plan to 3D print the rotating part? (the one with the wheel inside, I call it the "caster") I'm guessing based on the fillets on the part. If you are, it seems like there are several ways to print it stronger.

Why stick with hex shaft for dead axle? Seems like you can save a marginal amount of weight by using circular shaft.

Are you sure you have sufficient belt wrap on the pulley between the 775pros, if you're using a single belt for the whole thing?

What are you planning for the encoders?

Do you plan to 3D print the rotating part? (the one with the wheel inside, I call it the "caster") I'm guessing based on the fillets on the part. If you are, it seems like there are several ways to print it stronger.

Why stick with hex shaft for dead axle? Seems like you can save a marginal amount of weight by using circular shaft.

Can you post a better picture of the bearing setup?

Thanks for sharing your design!

1. The module was wanted to be longer and not a square in order to potentially fit a larger intake or similar mech. Gears needed would have been overly bulky and awkward
2. Not sure your meaning. There is space between the two pulleys both on top and on bottom, if that is what you mean
3. Versaplanetary integrated encoder on a 1:1 pulley ratio a la Stryke Force. Also a backup hall effect sensor I do not have modeled
4. We may end up making it three pieces bolted together like we did last year. I have not consulted my 3D printing expert yet, nor have we decided what printer we are going to purchase
5. We have a bunch of hex stock and hex bearings, but I guess I could have slimmed the wheel down a bit more and used a smaller shaft, you are right
6. Like this except smaller. It surprisingly worked super well last year for us.

Thanks for the questions. Like I said it will look better once I mount it to a frame and bellypan.

__________________
"Perfection is not attainable, but if we chase perfection we can catch excellence." - Vince Lombardi

Chak is talking specifically about the belt's wrap around the pulleys. To make sure the belt doesn't skip (among other things above my paygrade), it's important to make sure the belt has sufficient wrap around pulleys, especially those as small as 12t like the one you've used. If you want to understand wrap, think about how many pulley teeth the belt is contacting at once. The more teeth the belt is contacting, the better spread the load is and the better engaged the belt is, making the mechanism much less prone to skipping.

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Here are some quotes that drive me and my team to be successful: (some are mine, some are borrowed, and the list will continue to grow)"Once you've decided that it isn't a code problem, isn't a mechanical problem, and isn't an electrical problem, after all that blaming you now have a culture problem.""Precedence is no excuse for being wrong""Aesthetics are great, but not at the expense of functionality.""An entire team rallied around a potentially wrong decision is better than half a team rallied around the right one. And if that potentially wrong decision ends up being the right one, that team will be successful."

My views do not necessarily represent the views of my team or any other groups I am affiliated with.

Chak is talking specifically about the belt's wrap around the pulleys. To make sure the belt doesn't skip (among other things above my paygrade), it's important to make sure the belt has sufficient wrap around pulleys, especially those as small as 12t like the one you've used. If you want to understand wrap, think about how many pulley teeth the belt is contacting at once. The more teeth the belt is contacting, the better spread the load is and the better engaged the belt is, making the mechanism much less prone to skipping.

I did think about this. There is a 3/8 hex shaft pressed onto the 775 and an 18 tooth pulley instead of the 12 tooth pinion pulley. The pinion pulley is out of stock constantly, so I went with a larger pulley for that and to get more teeth in contact with the belt.

__________________
"Perfection is not attainable, but if we chase perfection we can catch excellence." - Vince Lombardi